Greetings,
We are using tomcat6 cluster in two data-centers with replicated sessions. We
are not using multicast because multicast broadcast between network
subnets/zones is difficult to setup, so instead we are using static members
(data center 1: webd101, and webd102 / data center 2: webd201, webd202).
Everything works fine during normal hours and *all 4* servers receive session
replication... but if I go home for the night and come back in the morning...
data center 1 does not replicate new sessions to data center 2 (and vice
versa). For example, a new session will get replicated between: webd101
and webd102 ... but it will not make its way over to webd201 and webd202.
It's like the connection between data centers gets clipped by the ??firewall??
... and won't automatically pick back up.
The strange thing is... the heartbeats are still flowing so all 4 tomcat
instances still know they are all alive.
I'm currently testing explicity setting the firewall to "never" clip
connections on port 4000... I have to wait until tomorrow to see if it works.
In the meantime... are there any other server.xml settings I can set to try and
get this to pick back up?
I found one error message in catalina.out (only on 1 of 4 clusters):
----------------------------
Apr 11, 2009 4:08:47 AM
org.apache.catalina.tribes.transport.nio.NioReplicationTask run
WARNING: IOException in replication worker, unable to drain channel. Probable
cause: Keep alive socket closed[Connection reset by peer].
---------------------------
Below is the cluster section of my server.xml:
<!-- Clustering support
http://tomcat.apache.org/tomcat-6.0-doc/cluster-howto.html -->
<Cluster
className="org.apache.catalina.ha.tcp.SimpleTcpCluster">
<!-- Specifies not to replicate session data
from files that can't alter sessions -->
<Valve
className="org.apache.catalina.ha.tcp.ReplicationValve"
filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.html;.*\.css;.*\.txt;.*\.pdf;.*\.jsp;"/>
<!-- Default High Avialibilty Manager -->
<Manager
className="org.apache.catalina.ha.session.DeltaManager"
domainReplication="false"
expireSessionsOnShutdown="false"
notifyListenersOnReplication="true"/>
<!-- Default Send Receive Channels -->
<Channel
className="org.apache.catalina.tribes.group.GroupChannel">
<!-- Default Non Blocking Receiver -->
<Receiver
className="org.apache.catalina.tribes.transport.nio.NioReceiver"
address="auto"
port="4000"
autoBind="0"
selectorTimeout="100"
maxThreads="6"/>
<!-- Default Sender -->
<Sender
className="org.apache.catalina.tribes.transport.ReplicationTransmitter">
<Transport
className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>
</Sender>
<!-- Only Ping Static Entries (No
Multicast) -->
<Interceptor
className="org.apache.catalina.tribes.group.interceptors.TcpPingInterceptor"
staticOnly="true" />
<Interceptor
className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>
<!-- Static Members -->
<Interceptor
className="org.apache.catalina.tribes.group.interceptors.StaticMembershipInterceptor">
<!--
<Member
className="org.apache.catalina.tribes.membership.StaticMember"
port="4000"
host="webd101"
uniqueId="{10,101,1,121,0,0,0,0,0,0,0,0,0,0,0,0}"/>
-->
<Member
className="org.apache.catalina.tribes.membership.StaticMember"
port="4000"
host="webd102"
uniqueId="{10,101,1,122,0,0,0,0,0,0,0,0,0,0,0,0}"/>
<Member
className="org.apache.catalina.tribes.membership.StaticMember"
port="4000"
host="webd201"
uniqueId="{10,102,1,121,0,0,0,0,0,0,0,0,0,0,0,0}"/>
<Member
className="org.apache.catalina.tribes.membership.StaticMember"
port="4000"
host="webd202"
uniqueId="{10,102,1,122,0,0,0,0,0,0,0,0,0,0,0,0}"/>
</Interceptor>
<Interceptor
className="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>
<Interceptor
className="com.custom.tomcat.interceptors.DisableMcastInterceptor" />
<Interceptor
className="org.apache.catalina.tribes.group.interceptors.ThroughputInterceptor"/>
</Channel>
</Cluster>
Thanks for any help in advance!
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